Fernando Torres scored twice as Chelsea hammered Belgian side Genk 5-0, to equal their biggest ever Champions League win.
Former Liverpool midfielder Raul Meireles opened the scoring with a long range effort, before Torres grabbed his two goals.
Defender Branislav Ivanovic and substitute Salomon Kalou finished off the thrashing.
The Blues are now top of their group with seven points from three games.
Elsewhere an injury time strike from Wales captain Aaron Ramsey secured victory for Arsenal away at French side Marseille.
The midfielder fired in from just inside the area with almost the last kick of the game.
Before then it looked like the match would be heading for a draw, with few chances for either team.
The win will come as a huge relief to boss Arsene Wenger, who has seen his side struggle so far this season.